In a D.C. generator the critical resistance can be increased by_____________?

Related Mcqs:

1. In a D.C. generator the critical resistance refers to the resistance of_____________?

   A. brushes
   B. field
   C. armature
   D. load

2. The critical resistance of the D.C. generator is the resistance of_____________?

   A. field
   B. brushes
   C. armature
   D. load

3. Two generators A and B have 6-poles each. Generator A has wave wound armature while generator B has lap wound armature. The ratio of the induced e.m.f. is generator A and B will be_______________?

   A. 2 : 3
   B. 3 : 1
   C. 3 : 2
   D. 1 : 3

4. In a D.C. generator in case the resistance of the field winding is increased, then output voltage will____________?

   A. increase
   B. decrease
   C. remain unaffected
   D. fluctuate heavily

5. Which of the following components of a D.C, generator plays vital role for providing direct current of a D.C. generator ?

   A. Dummy coils
   B. Commutator
   C. Eye bolt
   D. Equilizer rings

6. The e.m.f. generated by a shunt wound D.C. generator isE. Now while pole flux remains constant, if the speed of the generator is doubled, the e.m.f. generated will be_______________?

   A. E/2
   B. 2E
   C. slightly less than E
   D. E

7. In a D.C. generator the ripples in the direct e.m.f. generated are reduced by_____________?

   A. using conductor of annealed copper
   B. using commutator with large number of segments
   C. using carbon brushes of superior quality
   D. using equiliser rings

8. The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be_____________?

   A. 640 V
   B. 620 V
   C. 600 V
   D. 580 V

9. The terminal voltage of a series generator is 150 V when the load current is 5 A. If the load current is increased to 10 A, the terminal voltage will be____________?

   A. 150 V
   B. less than 150 V
   C. greater than 150 V
   D. none of the above

10. Two D.C. shunt generators, each with armature resistance of 0.02 ohm and field resistance of 50 ohm run in parallel and supply a total current of 1000 amperes to the load circuit. If their e.m.fs. are 270 V and 265 V, their bus bar voltage will be_____________________?

    A. 270 V
    B. 267.5 V
    C. 265 V
    D. 257.4 V